PokéBase - Pokémon Q&A
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Nothing! XD

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You can't trade them back even though they are in the same Gen. You can't because they weren't in the game and they weren't even coded in those games.
Source: https://www.reddit.com/r/PokeMoonSun/comments/7jsgy1/cant_trade_blacephalon_or_poipole_back_to_sunmoon/?utm_source=BD&utm_medium=Search&utm_name=Bing&utm_content=PSR1

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What happens when you transfer them anyway?
I don't think it would let you.
it won't allow you to, correct